We look at the division of 77999424 by 51 
The aim is to understand the frequency of 51 in 77999424.

Advancing to step 1:
If we divide 7 by 51, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 51

Step 2:
When dividing 77 by 51, we get 1 with a remainder of 26.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 51 from 77 leaves us with 26.
Append the next digit (9) from the dividend to 26 and continue with: 269 / 51

Step 3:
51 can be fit into 269 5 times, resulting in a remainder of 14.
Use 5 as the next digit of our solution. 
Result so far: 15.0
The remainder is 14 after subtracting 255 from 269.
Include the next digit (9) from the dividend after 14, then repeat: 149 / 51

On to step 4:
51 goes into 149 2 times with a remainder of 47.
Put 2 as the next digit of the answer. 
Result so far: 152.0
Deduct 102 from 149 and we're left with 47.
Take the next digit (9) from the dividend and append it to 47, then repeat: 479 / 51

Step 5:
479 divided by 51 is 9 with a remainder of 20.
Put 9 as the next digit of the answer. 
Result so far: 1529.0
Deduct 459 from 479 and we're left with 20.
Fetch the next digit (4) from the dividend, attach it to 20 and continue: 204 / 51

Let's proceed to step 6:
If we divide 204 by 51, we get 4 and a remainder of 0.
The next digit of our result is 4. 
Result so far: 15294.0
The remainder is 0 after subtracting 204 from 204.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 51

Moving on to step 7:
51 goes into 2 0 times with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 152940.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (4) from the dividend, attach it to 2 and continue: 24 / 51

Going ahead to step 8:
The number 51 fits into 24 0 times, leaving a remainder of 24.
Record the quotient 0 as the next digit in the result. 
Result so far: 1529400.0
The remainder is 24 after subtracting 0 from 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 9:
51 goes into 240 4 times with a remainder of 36.
Write down 4 as next digit of the result. 
Result so far: 1529400.4
The remainder is 36 after subtracting 204 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 10:
360 divided by 51 is 7 with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 1529400.47
The remainder is 3 after subtracting 357 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 11:
51 can be fit into 30 0 times, resulting in a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 1529400.47
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 12:
300 divided by 51 is 5 with a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 1529400.4705
The remainder is 45 after subtracting 255 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Advancing to step 13:
51 can be fit into 450 8 times, resulting in a remainder of 42.
Put 8 as the next digit of the answer. 
Result so far: 1529400.47058
Subtracting 408 from 450 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 14:
When dividing 420 by 51, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 1529400.470588
If we take 408 away from 420, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 1529400.470588 with a remainder of 1.2e-06.